JP7200554B2 - Display device, display system, display device control method, and display system control method - Google Patents

Description

The present invention relates to a display device, a display system, a display device control method, and a display system control method.

Patent Literature 1 describes a technique for authenticating an electronic device that requests connection to a display device such as a projector, using authentication information such as a password. In this technique, the electronic device transmits the authentication information to the display device in response to the input of the authentication information from the user, and the display device and the display device succeed in authenticating the electronic device using the authentication information. Establish a communication connection with an electronic device.

JP 2011-118243 A

When connecting a plurality of electronic devices to the display device described in Patent Document 1, it is necessary to always input authentication information for each electronic device, which takes time and effort.

In one aspect of the display device according to the present invention, when valid authentication information is received from the first electronic device, a first connection unit that establishes a communication connection with the first electronic device, and communication with the first electronic device. an inquiry unit that, when receiving a communication request from a second electronic device while the connection is established, inquires of the first electronic device about a communication connection with the second electronic device; a second connection unit that establishes a communication connection with the second electronic device when a response to the inquiry indicates permission for communication connection with the second electronic device.

Another aspect of the display device according to the present invention is a first connection unit that establishes a communication connection with the first electronic device when valid authentication information is received from the first electronic device; When a request for communication is received from a second electronic device in the first state in which the communication connection is established, permitted device information indicating an electronic device permitted to communicate with the display device in the first state and a third connection for establishing a communication connection with the second electronic device, if the second electronic device is indicated.

One aspect of the display system according to the present invention includes a display device, a first electronic device, and a second electronic device, wherein the first electronic device transmits valid authentication information, and the second When transmitting a response to an inquiry about communication connection with an electronic device, the second electronic device transmits a request regarding communication, and the display device receives the valid authentication information from the first electronic device, When a request for communication is received from the second electronic device in a state in which a communication connection is established between a first connection unit that establishes a communication connection with the first electronic device and the first electronic device, the an inquiry unit for executing the inquiry to the first electronic device; 2 connections.

According to one aspect of the display device control method of the present invention, when valid authentication information is received from a first electronic device, a communication connection is established with the first electronic device, and the communication connection with the first electronic device is established. In the established state, when receiving a request for communication from a second electronic device, an inquiry is made to the first electronic device regarding a communication connection with the second electronic device, and a response to the inquiry is received. , establishing a communication connection with the second electronic device when indicating permission to establish a communication connection with the second electronic device;

One aspect of a display system control method according to the present invention is a display system control method including a display device, a first electronic device, and a second electronic device, wherein the first electronic device When authentication information is transmitted, the display device establishes a communication connection with the first electronic device when receiving the valid authentication information from the first electronic device, and the second electronic device issues a communication request. When the display device receives the communication request from the second electronic device while the communication connection with the first electronic device is established, the display device sends the executing an inquiry about a communication connection with a second electronic device, the first electronic device transmitting a response to the inquiry, to establish a communication connection with the second electronic device.

1 is a diagram showing an example of a display system 1; FIG. 1 is a diagram showing an example of a projector 100; FIG. 2 is a diagram showing an example of a first electronic device 200; FIG. 4 is a sequence diagram for explaining an example of the operation of the display system 1; FIG. It is a figure which shows an example of an inquiry image. 4 is a sequence diagram for explaining an example of the operation of the display system 1; FIG. 4 is a flowchart for explaining an example of the operation of the projector 100; 4 is a flowchart for explaining an example of the operation of the first electronic device 200; It is a figure which shows an example of permitted apparatus information. FIG. 10 is a diagram showing an example of a projector 100 according to modification 2;

<A: First Embodiment>
<A1: Overview of Display System 1>
FIG. 1 is a diagram showing an example of a display system 1 including a projector 100 according to the first embodiment. The display system 1 includes a projector 100 , a first electronic device 200 and a second electronic device 300 .

The first electronic device 200 and the second electronic device 300 are, for example, information processing apparatuses such as PCs (Personal Computers) capable of outputting image information representing images. Each of first electronic device 200 and second electronic device 300 is not limited to a PC, and may be a mobile device such as a smart phone. The number of each of first electronic device 200 and second electronic device 300 may be one or more.

The first electronic device 200 and the second electronic device 300 each communicate with the projector 100 by wire or wirelessly. For example, the first electronic device 200 and the second electronic device 300 each communicate with the projector 100 via a wireless LAN (Local Area Network).

First electronic device 200 and second electronic device 300 each transmit image information to projector 100 . The image information transmitted by the first electronic device 200 is hereinafter referred to as "first image information". The image information transmitted by the second electronic device 300 is referred to as "second image information".

Projector 100 is an example of a display device. Projector 100 establishes a communication connection with each of first electronic device 200 and second electronic device 300 . For example, the projector 100 projects and displays an image based on the first image information onto the projection plane 500 and projects and displays an image based on the second image information onto the projection plane 500 .

An example in which the first electronic device 200 is used by the teacher and the second electronic device 300 is used by the student will be described below. It goes without saying that the first electronic device 200 may be used by persons who are not teachers, and the second electronic device 300 may be used by persons who are not students.

The projector 100 authenticates the first electronic device 200 used by the teacher using the valid password for communication connection set in the projector 100, and if the authentication succeeds, the first electronic device 200 is established. establish a communication connection; Hereinafter, the valid password for communication connection is simply referred to as "valid password". A valid password is an example of valid authentication information. Valid authentication information is not limited to a valid password, but may be a valid keyword and can be changed as appropriate.
For the second electronic device 300 used by the student, the projector 100 establishes a communication connection with the second electronic device 300 without authentication using a valid password if a predetermined condition is satisfied.

<A2: Configuration example of projector 100>
FIG. 2 is a diagram showing an example of the projector 100 described above. The projector 100 includes an operation receiving unit 110, an image processing unit 120, a light valve driving unit 130, a projection unit 140, a light source driving unit 150, a projector-side communication unit 160, a projector-side storage unit 170, and a projector-side and a control unit 180 . The projection unit 140 includes a light source 141 , an R liquid crystal light valve 142 a , a G liquid crystal light valve 142 b , a B liquid crystal light valve 142 c , and a projection optical system 143 .

Here, "R" means red. "G" means green. "B" means blue. When it is not necessary to distinguish between the R liquid crystal light valve 142a, the G liquid crystal light valve 142b, and the B liquid crystal light valve 142c, the R liquid crystal light valve 142a, the G liquid crystal light valve 142b, and the B liquid crystal light valve 142b are used. Each of the liquid crystal light valves 142c is simply referred to as a "liquid crystal light valve 142". The liquid crystal light valve 142 is composed of a liquid crystal panel. The liquid crystal light valve 142 functions as a light modulator that modulates light.

The operation receiving unit 110 is, for example, various operation buttons, operation keys, or a touch panel. The operation receiving unit 110 receives a user's input operation. The operation receiving unit 110 may be a remote controller that wirelessly or wiredly transmits information based on input operations. In this case, the projector 100 includes a receiver that receives information from the remote controller. The remote controller includes various operation buttons, operation keys, or a touch panel for receiving input operations. Further, the operation reception unit 110 may be a wireless reception unit that wirelessly receives an operation input for an application running on an information terminal device such as a smart phone from the information terminal device.

The image processing unit 120 generates an image signal by performing image processing on the first image information or the second image information. The image processing unit 120 generates image information indicating a synthesized image obtained by synthesizing an image indicated by the first image information and an image indicated by the second image information, and performs image processing on the image information indicating the synthesized image. may generate an image signal. The image processing executed by the image processing unit 120 includes, for example, resolution conversion processing or frame rate conversion processing. In the resolution conversion process, the image processing unit 120 converts the resolution of the image information into the resolution designated by the projector-side control unit 180, such as the resolution of the liquid crystal light valve 142. FIG. In the frame rate conversion process, the image processing section 120 converts the frame rate of the image information into the frame rate specified by the projector-side control section 180 . The image processing unit 120 may perform both resolution conversion processing and frame rate conversion processing, or may perform other image processing such as so-called gamma correction processing.

Based on the image signal generated by the image processing unit 120, the light valve driving unit 130 operates the liquid crystal light valves 142, specifically, the R liquid crystal light valve 142a, the G liquid crystal light valve 142b, and the B liquid crystal light valve 142c. drive.

Projection unit 140 projects a projection image based on image information onto projection plane 500 . Projection unit 140 is an example of a display unit. Projection surface 500 is an example of a display surface. A projection surface 500, for example a screen. The projection surface 500 is not limited to a screen and can be changed as appropriate. For example, projection surface 500 can be a wall or a whiteboard.

The light source 141 is, for example, an LED (Light Emitting Diode). The light source 141 is not limited to an LED and can be changed as appropriate. For example, light source 141 may be a xenon lamp, an ultra-high pressure mercury lamp, or a laser light source.

Variation in luminance distribution in the light emitted from the light source 141 is reduced by an integrator optical system (not shown). The light emitted from the light source 141 is then separated into the three primary colors of light, R, G, and B, by a color separation optical system (not shown). The R color light component enters the R liquid crystal light valve 142a. The G color light component enters the G liquid crystal light valve 142b. The B color light component enters the B liquid crystal light valve 142c.

The liquid crystal light valve 142 is composed of, for example, a liquid crystal panel in which liquid crystal is present between a pair of transparent substrates. The liquid crystal light valve 142 has a rectangular pixel region 142d composed of a plurality of pixels 142p arranged in a matrix. In the liquid crystal light valve 142, a drive voltage is applied to the liquid crystal for each pixel 142p.

When the light valve driving section 130 applies a driving voltage based on the image signal input from the image processing section 120 to each pixel 142p, the light transmittance of each pixel 142p is set to the light transmittance based on the image signal. Therefore, the light emitted from the light source 141 is modulated by passing through the pixel region 142d, and an image based on the image signal is formed for each color light. A color synthesizing optical system (not shown) synthesizes the images generated by the liquid crystal light valves 142 for each pixel 142p to generate a color image.

The projection optical system 143 expands the color image generated by the color synthesizing optical system to generate a projection image, and projects the projection image onto the projection surface 500 for display.

The light source driver 150 drives the light source 141 . For example, the light source driving unit 150 causes the light source 141 to emit light when the operation receiving unit 110 receives an operation input to turn on the power.

The projector-side communication unit 160 wirelessly communicates with each of the first electronic device 200 and the second electronic device 300 .

The projector-side storage unit 170 is a computer-readable recording medium. The projector-side storage unit 170 stores a program that defines the operation of the projector 100 and various information. The projector-side storage unit 170 stores valid passwords as part of various information. A valid password is input from the operation receiving unit 110, for example.

The projector-side control unit 180 is a computer such as a CPU (Central Processing Unit). The projector-side control unit 180 may be composed of one or more processing devices. The projector-side control unit 180 implements a first connection unit 181, an inquiry unit 182, a second connection unit 183, and a display control unit 184 by reading and executing a program stored in the projector-side storage unit 170. do.

The first connection unit 181 controls the communication connection with the first electronic device 200 or the second electronic device 300 when the communication connection between the projector 100 and the first electronic device 200 is not established. For example, the first connection unit 181 establishes a communication connection with the first electronic device 200 when receiving a valid password from the first electronic device 200 via the projector-side communication unit 160 in a situation where connection is not established. A connection establishment state is an example of a first state.

When the inquiry unit 182 receives a search request from the second electronic device 300 via the projector-side communication unit 160 in the connection establishment state, the inquiry unit 182 asks the first electronic device 200 about the communication connection with the second electronic device 300. query. A search request is a request for searching for a candidate for communication connection with the source of the search request. A search request is an example of a request for communication.

The second connection unit 183 receives a response to the inquiry from the inquiry unit 182 from the first electronic device 200 in the connection establishment state.

The second connection unit 183 establishes communication connection with the second electronic device 300 when the response to the inquiry indicates permission for communication connection with the second electronic device 300 .
For example, when the response to the inquiry indicates permission, the second connection unit 183 establishes communication connection with the second electronic device 300 in response to subsequent reception of a connection request from the second electronic device 300 .
In other words, when the response to the inquiry indicates permission, second connection unit 183 receives a subsequent connection request from second electronic device 300 without receiving a valid password from second electronic device 300. In response, a communication connection is established with the second electronic device 300 .
In addition, when the response to the inquiry indicates permission, the second connection unit 183 may establish communication connection with the second electronic device 300 regardless of whether or not there is a connection request from the second electronic device 300 .
Here, the connection request is a request for communication connection with the transmission source of the connection request.

Display control section 184 controls projection section 140 using image processing section 120 , light valve driving section 130 and light source driving section 150 . For example, the display control unit 184 causes the projection unit 140 to project an image corresponding to image information received by the projector-side communication unit 160 from at least one of the first electronic device 200 and the second electronic device 300 onto the projection surface 500. to execute.

<A3: Configuration Example of First Electronic Device 200>
FIG. 3 is a diagram showing an example of the first electronic device 200. As shown in FIG. The first electronic device 200 includes a first electronic device side communication section 201 , an input section 202 , a display section 203 , a first electronic device side storage section 204 , and a first electronic device side control section 205 .

The first electronic device side communication unit 201 wirelessly communicates with the projector 100 . The input unit 202 is, for example, a keyboard or a touch panel, and receives various inputs from the teacher. The display unit 203 displays various information. The first electronic device storage unit 204 is a computer-readable recording medium. The first electronic device storage unit 204 stores a program that defines the operation of the first electronic device 200 and various information. The first electronic device side control unit 205 is a computer such as a CPU. The first electronic device side control unit 205 may be composed of one or a plurality of processing devices. The first electronic device control unit 205 controls the first electronic device 200 by reading and executing a program stored in the first electronic device storage unit 204 .

<A4: Description of Operation of Display System 1>
In the following, an example will be described in which the first electronic device 200 used by the teacher establishes communication connection with the projector 100 using a valid password, and then the second electronic device 300 used by the student establishes communication connection with the projector 100 .

FIG. 4 is a sequence diagram for explaining the operation when the response from the first electronic device 200 to the inquiry from the inquiry unit 182 indicates permission for communication connection with the second electronic device 300, in other words, the display system. 1 is a sequence diagram for explaining a control method No. 1; FIG.

In step S<b>101 , the first electronic device-side control section 205 of the first electronic device 200 transmits a search request from the first electronic device-side communication section 201 in response to the teacher's input operation to the input section 202 .

When the first connection unit 181 of the projector 100 receives a search request whose transmission source is the first electronic device 200, in step S102, the first connection unit 181 of the projector 100 sends a password setting completion notification indicating that a password has been set as a response to the search request. It transmits to the first electronic device 200 . Here, setting a password means that a valid password must be entered in order to establish a communication connection with the projector 100 .

Upon receiving the response to the search request from the projector 100, the first electronic device-side control unit 205 of the first electronic device 200 displays the response to the search request, in this case a password setting completion notice, on the display unit 203 in step S103. For example, in step S<b>103 , the display unit 203 displays the projector 100 as a device capable of communication connection with the first electronic device 200 and displays that a password has been set for the projector 100 .

When connecting the first electronic device 200 to the projector 100, the teacher operates the input unit 202 to select the projector 100 as the communication connection destination of the first electronic device 200, and inputs the password.

When the input unit 202 receives the selection of the projector 100 and the password from the teacher in step S104, the first electronic device side control unit 205 sends a connection request to the projector 100 in step S105. , send the password and.

When receiving the connection request and the password from the first electronic device 200, the first connection unit 181 of the projector 100 determines whether the password received from the first electronic device 200 is a valid password stored in the projector-side storage unit 170. determine whether or not If the password received from the first electronic device 200 is valid, the first connection unit 181 successfully authenticates the first electronic device 200 .
If the password received from first electronic device 200 is different from the valid password, first connection unit 181 fails to authenticate first electronic device 200 and does not establish communication connection with first electronic device 200. , an authentication failure notification indicating authentication failure is transmitted to the first electronic device 200 .

When the first connection unit 181 successfully authenticates the first electronic device 200, the first connection unit 181 transmits a connection permission notification permitting connection to the projector 100 to the first electronic device 200 in step S106. A communication connection is established with the electronic device 200 .

Subsequently, in step S107, the second electronic device 300 transmits a search request according to the operation by the student.

When the inquiry unit 182 of the projector 100 receives a search request whose transmission source is the second electronic device 300 in the connection establishment state, in step S108, the inquiry unit 182 of the projector 100 requests the first electronic device 200 to establish a communication connection with the second electronic device 300. Send an inquiry notification to inquire whether or not to allow

Upon receiving the inquiry notification, the first electronic device-side control unit 205 of the first electronic device 200 displays an inquiry image on the display unit 203 in step S109 to inquire whether or not to permit communication connection with the second electronic device 300. do. For example, the image shown in FIG. 5 is used as the inquiry image. Note that the query image is not limited to the image shown in FIG. 5 and can be changed as appropriate. Viewing the display of the inquiry image from a different point of view, the inquiry unit 182 causes the first electronic device 200 to display the inquiry notification by transmitting the inquiry notification to the first electronic device 200 .

Returning to FIG. 4, the teacher performs communication between the second electronic device 300 and the projector 100 in order to cause the projector 100 to project an image corresponding to the image information output by the second electronic device 300 used by the student, for example. If the connection is to be permitted, the user operates the input unit 202 to input a permission reply indicating permission for communication connection with the second electronic device 300 .

When the input unit 202 receives the permission reply in step S110, the first electronic device-side control unit 205 transmits the permission reply to the projector 100 as a response to the inquiry in step S111.

Upon receiving the permission response, the second connection unit 183 of the projector 100 cancels the password setting for the second electronic device 300, and in step S112, sends a password non-setting notification indicating that the password is not set in response to the search request. It is transmitted to the second electronic device 300 as a response. Also, the permission reply may include a cancellation instruction for canceling the password setting. In this case, the second connection unit 183 cancels the password setting according to the cancellation instruction.

Upon receiving the password non-setting notification from the projector 100, the second electronic device 300 displays the projector 100 as a device capable of communication connection with the second electronic device 300 in step S113. In addition, in step S113, the second electronic device 300 may also display that a password has not been set for the projector 100. FIG.

When connecting the second electronic device 300 to the projector 100 , the student operates the second electronic device 300 to select the projector 100 as the communication connection destination of the second electronic device 300 . At this time, the student does not need to enter a valid password.

Upon receiving the selection of the projector 100 from the student in step S114, the second electronic device 300 transmits a connection request requesting connection with the projector 100 to the projector 100 in step S115.

When the second connection unit 183 of the projector 100 receives the connection request from the second electronic device 300, in step S116, the second connection unit 183 of the projector 100 transmits to the second electronic device 300 a connection permission notification that permits connection to the projector 100. , to establish a communication connection between the projector 100 and the second electronic device 300 .

Therefore, the student can connect the second electronic device 300 to the projector 100 without entering a valid password into the second electronic device 300, thereby reducing the trouble of the student entering the password.

A response from the first electronic device 200, which is connected for communication using a valid password, can be regarded as trustworthy information. Since the communication connection with the second electronic device 300 is established based on this reliable information, it is possible to suppress the deterioration of the security level regarding the communication connection with the projector 100 .

FIG. 6 is a sequence diagram for explaining the operation when the response from the first electronic device 200 to the inquiry from the inquiry unit 182 indicates prohibition of the communication connection with the second electronic device 300. As shown in FIG. In the processing shown in FIG. 6, the same reference numerals are assigned to the same processing as the processing shown in FIG. Hereinafter, among the processes shown in FIG. 6, the processes different from the processes shown in FIG. 4 will be mainly described.

In step S109, if the second electronic device 300 shown in the inquiry image is not an electronic device recognized by the teacher, the teacher operates the input unit 202 to communicate with the second electronic device 300 shown in the inquiry image. Enter a prohibition reply indicating prohibition of communication connection.

When the first electronic device-side control unit 205 of the first electronic device 200 receives the prohibited reply in step S201, it transmits the prohibited reply to the projector 100 as a response to the inquiry in step S202.

Upon receiving the prohibition reply, the second connection unit 183 of the projector 100 sets a password, and in step S203, transmits a password set notification to the second electronic device 300 as a response to the search request. If a password has already been set when the prohibition reply is received, the second connection unit 183 maintains the password setting. Here, the prohibition reply from first electronic device 200 may include a setting instruction to set a password. In this case, the second connection unit 183 executes password setting according to the setting instruction.

Upon receiving the search request response from the projector 100, the second electronic device 300 displays the search request response, in this case, a password setting notification, in step S204. This display is similar to the display in step S103, for example.

When the student connects the second electronic device 300 to the projector 100 in a situation where the teacher prohibits the communication connection of the second electronic device 300, for example, in a situation where the teacher mistakenly prohibits the communication connection, the second electronic device 300 to select the projector 100 as the communication connection destination of the second electronic device 300 and enter the password.

Upon receiving the selection of the projector 100 and the password from the student in step S205, the second electronic device 300 transmits to the projector 100 in step S206 a connection request requesting connection with the projector 100 and the password.

Upon receiving the connection request and password from the second electronic device 300, the second connection unit 183 of the projector 100 determines whether the password received from the second electronic device 300 is valid. If the password received from the second electronic device 300 is valid, the second connection unit 183 successfully authenticates the second electronic device 300 .

When the second connection unit 183 succeeds in authenticating the second electronic device 300, in step S207, the second connection unit 183 transmits to the second electronic device 300 a connection permission notification that permits connection with the projector 100, thereby connecting the projector 100 and the second electronic device 300 to each other. A communication connection is established with the electronic device 300 .

In this way, even when the response to the inquiry from first electronic device 200 is a prohibition response, second connection unit 183 establishes communication connection with second electronic device 300 upon receiving a valid password from second electronic device 300. Establish.
Therefore, even if the teacher erroneously inputs a prohibited answer, the student can connect the second electronic device 300 to the projector 100 by inputting a valid password into the second electronic device 300 .
In addition, when the password received from the second electronic device 300 is different from the valid password in a situation where the response to the inquiry to the first electronic device 200 is a prohibition response, the second connection unit 183 communicates with the second electronic device 300. Do not establish connection.

<A5: Description of Operation of Projector 100>
FIG. 7 is a flowchart for explaining in detail the operations of the projector 100 from the reception of a search request to the transmission of a response to the search request.

Upon receiving the search request in step S11, the first connection unit 181 determines whether or not there is an electronic device that has established communication connection with the projector 100 in step S12.

If there is no electronic device with established communication connection in step S12, the first connection unit 181 sets a password in step S18. If a password has already been set, the first connection unit 181 maintains the password setting in step S18. Subsequently, in step S19, the first connection unit 181 transmits a response to the search request to the sender of the search request. In step S19, if a password has been set, a password setting notification is used as a response to the search request.

If there is an electronic device that has established a communication connection in step S12, the first connection unit 181 determines whether or not a communication connection has been established with the first electronic device 200 in step S13. If the communication connection with the first electronic device 200 is not established in step S13, step S18 is executed.

When the communication connection with the first electronic device 200 is established in step S13, the inquiry unit 182 transmits an inquiry notification to the first electronic device 200 in step S14.
Subsequently, when receiving the response to the inquiry notification in step S15, the second connection unit 183 determines whether or not the response to the inquiry notification is a permission reply in step S16.

If the response to the inquiry notification is a permission response in step S16, the second connection unit 183 cancels the password setting and puts the password in a non-setting state in step S17. If the password has not yet been set, the second connection unit 183 maintains the state in which the password has not been set in step S17.

Subsequently, the second connection unit 183 transmits a response to the search request to the sender of the search request in step S19. In step S19, if a password has not been set, a password unset notification is used as a response to the search request.

If the response to the inquiry notification is a prohibition response in step S16, step S18 is executed.

In this way, if the first electronic device 200 used by a teacher who is a highly reliable user authenticated by a valid password is set as the transmission destination of the inquiry notification, the credibility of the response to the inquiry notification can be verified. can be high Therefore, it is possible to control the communication connection with the second electronic device 300 based on the highly credible response, and it is possible to suppress the deterioration of the security level regarding the communication connection with the projector 100 . In addition to the first electronic device 200 used by the teacher, the first electronic device used by the teacher is the destination of the inquiry notification in a situation where there is another first electronic device 200 authenticated by a valid password. 200 may be preset, or another first electronic device 200 authenticated by a valid password may be used.

<A6: Description of Operation of First Electronic Device 200>
FIG. 8 is a flowchart for explaining in detail the operation of the first electronic device 200 from the reception of the inquiry notification to the transmission of the response to the inquiry notification. In addition, in the operation shown in FIG. 8, the permission reply includes a release instruction, and the prohibition reply includes a setting instruction.

Upon receiving the inquiry notification in step S21, the first electronic device-side control unit 205 causes the display unit 203 to display a dialog corresponding to the inquiry notification in step S22. The dialog display includes the display shown in FIG. 5 described above. The teacher uses the input unit 202 to input either a permitted response or a prohibited response as a response to the inquiry notification according to the displayed dialog.

Subsequently, when a permission reply is input in step S23, the first electronic device-side control section 205 adds a cancellation instruction to the permission reply in step S24. On the other hand, if a prohibited answer is input in step S23, a setting instruction is added to the prohibited answer in step S25.

When step S24 is completed, in step S26, the first electronic device side control unit 205 transmits a permission reply to which a cancellation instruction is added to the projector 100 as a response to the inquiry notification.
On the other hand, when step S25 is completed, in step S26, the first electronic device-side control unit 205 transmits the prohibition reply to which the setting instruction is added to the projector 100 as a response to the inquiry notification.

In this way, if the cancellation instruction is added to the permission reply, the projector 100 can cancel the password setting in accordance with the cancellation instruction, and it is possible to simplify the judgment as to whether or not the password setting needs to be canceled. Moreover, if a setting instruction is added to the prohibition reply, the projector 100 may execute password setting according to the setting instruction, and it is possible to simplify the determination of whether or not to execute password setting.

<B: Modification>
In the first embodiment, for example, a configuration exemplified below may be adopted.

<B1: Modification 1>
In the first embodiment, the first electronic device 200 may retain, in the first electronic device storage section 204, permitted device information indicating permitted devices permitted to communicate with the projector 100. FIG. The first electronic device side storage section 204 is an example of a storage section. FIG. 9 is a diagram showing an example of permitted device information. The permitted device information is not limited to the information shown in FIG. 9 and can be changed as appropriate.

In this case, if the second electronic device 300 is indicated in the permitted device information when receiving the inquiry notification, the first electronic device-side control section 205 transmits a permission reply as a response to the inquiry notification. On the other hand, if the second electronic device 300 is not indicated in the permitted device information when receiving the inquiry notification, the first electronic device-side control section 205 transmits a prohibition reply as a response to the inquiry notification.

According to Modification 1, the response to the inquiry notification can be automatically transmitted, so the burden of responding to the inquiry on the user of the first electronic device 200 can be reduced.

<B2: Modification 2>
In the first embodiment, the projector 100 may hold the permitted device information. Also, when there are a plurality of first electronic devices 200 , the projector 100 may hold permitted device information for each first electronic device 200 . In this case, the projector 100 may generate a response to the inquiry notification using the permitted device information corresponding to the first electronic device 200 with which the communication connection has been established.

FIG. 10 is a diagram showing an example of a projector 100 according to modification 2. As shown in FIG. In FIG. 10, the same symbols are assigned to the same configurations as those shown in FIG. The projector 100 shown in FIG. 10 will be described below, focusing on the configuration different from that shown in FIG.

The projector 100 shown in FIG. 10 has the third connection unit 185, does not have the inquiry unit 182 and the second connection unit 183, and the projector-side storage unit 170 is stored in the first electronic device 200 for each first electronic device 200. It differs from the projector 100 shown in FIG. 2 in that the corresponding permitted device information is held. The permitted devices indicated in each piece of permitted device information may be different from each other or may be the same.

The third connection unit 185 is realized by reading and executing a program stored in the projector-side storage unit 170 by the projector-side control unit 180 .
When the third connection unit 185 receives a search request from the second electronic device 300 in a state where the communication connection is established with one first electronic device 200, first, the third connection unit 185 receives the first electronic device with which the communication connection is established. Permission device information corresponding to the electronic device 200 is determined as specific permission device information.

Subsequently, the third connection unit 185 establishes a communication connection with the second electronic device 300 when the second electronic device 300 that is the transmission source of the search request is indicated in the specific permitted device information.
For example, when the second electronic device 300 is indicated in the specific permitted device information, the third connection unit 185 establishes communication connection with the second electronic device 300 in response to subsequent reception of a connection request from the second electronic device 300. Establish
Furthermore, when the second electronic device 300 is indicated in the specific permitted device information, the third connection unit 185 can access the second electronic device after that even if the valid password is not received from the second electronic device 300 . A communication connection is established with the second electronic device 300 in response to receiving a connection request from the electronic device 300 .
Note that when the second electronic device 300 is indicated in the specific permitted device information, the third connection unit 185 establishes a communication connection with the second electronic device 300 regardless of whether there is a connection request from the second electronic device 300 or not. may be established.

According to Modification 2, it is possible to determine whether or not a valid password is required for communication connection with the second electronic device 300 without making an inquiry to the first electronic device 200 . Therefore, compared to the first embodiment and modification 1, communication processing related to inquiries between the projector 100 and the first electronic device 200 can be reduced.

<B3: Modification 3>
In the first embodiment, modification 1 and modification 2, the user of the first electronic device 200 may be, for example, the moderator of the conference instead of the teacher. In this case, it is desirable that the user of the second electronic device 300 be a conference participant, not a student.

<B4: Modification 4>
In the first embodiment and Modifications 1 to 3, a connection request requesting communication connection with the second electronic device 300 may be used as the communication-related request instead of the search request.
In this case, for example, in the first embodiment, step S107 shown in FIG. 6 is followed by steps S203 to S206, and step S206 is followed by steps S108 and S109.
After that, either steps S109 and S110 shown in FIG. 4 or steps S201 and S202 shown in FIG. 6 are executed.
If step S111 is executed, then step S116 is executed.
On the other hand, when step S202 is executed, if the password transmitted in step S206 is valid, step S207 is executed, and if the password is not valid, communication connection is not established.

<B5: Modification 5>
In the first embodiment and modified examples 1 to 4, the display device is not limited to the projector 100 and can be changed as appropriate. For example, a liquid crystal display device or an EL display device may be used as the display device.

<B6: Modification 6>
In the first embodiment and Modifications 1 to 5, all or part of the functions realized by the projector-side control unit 180 executing a program are, for example, FPGA (field programmable gate array) or ASIC (Application Specific It may be implemented in hardware by an electronic circuit such as an IC).

<B7: Modification 7>
In the first embodiment and modified examples 1 to 6, the liquid crystal light valve 142 is used as an example of the light modulating device, but the light modulating device is not limited to the liquid crystal light valve and can be changed as appropriate. For example, the light modulation device may be configured using three reflective liquid crystal panels. Further, the optical modulation device may have a structure using one liquid crystal panel, a method using three digital mirror devices (DMD), a method using one digital mirror device, or the like. If only one liquid crystal panel or DMD is used as the light modulator, members corresponding to the color separating optical system and the color synthesizing optical system are unnecessary. In addition to the liquid crystal panel and DMD, a configuration capable of modulating the light emitted from the light source 141 can be employed as the light modulation device.

DESCRIPTION OF SYMBOLS 100... Projector, 110... Operation receiving part, 120... Image processing part, 130... Light valve drive part, 140... Projection part, 141... Light source, 142... Liquid crystal light valve, 143... Projection optical system, 150... Light source drive part, 160 Projector-side communication unit 170 Projector-side storage unit 180 Projector-side control unit 181 First connection unit 182 Inquiry unit 183 Second connection unit 184 Display control unit 185 Third connection.

Claims (8)

a first connection unit that establishes a communication connection with the first electronic device when valid authentication information is received from the first electronic device;
When receiving a request for communication from a second electronic device while the communication connection with the first electronic device is established, requesting the first electronic device about the communication connection with the second electronic device a query unit that executes a query;
a second connection unit that establishes a communication connection with the second electronic device when a response to the inquiry indicates permission for communication connection with the second electronic device ;
When the response indicates prohibition of communication connection with the second electronic device, the second connection unit establishes communication connection with the second electronic device upon receiving the valid authentication information from the second electronic device. establish a
display device. the request for communication is a search request for searching for a candidate for communication connection with the second electronic device;
The display device according to claim 1. the request for communication is a connection request requesting communication connection with the second electronic device;
The display device according to claim 1. The inquiry unit causes the first electronic device to display the inquiry,
The second connection unit receives an answer from the first electronic device as the response after the first electronic device receives an input of an answer to the inquiry from the user.
The display device according to any one of claims 1 to 3 . including a display device, a first electronic device, and a second electronic device,
The first electronic device transmits valid authentication information and also transmits a response to an inquiry about communication connection with the second electronic device,
The second electronic device transmits a request for communication,
The display device
a first connection unit that establishes a communication connection with the first electronic device when the valid authentication information is received from the first electronic device;
an inquiry unit for executing the inquiry to the first electronic device when receiving the communication request from the second electronic device while the communication connection with the first electronic device is established;
a second connection unit that establishes a communication connection with the second electronic device when a response to the inquiry indicates permission for communication connection with the second electronic device ;
When the response indicates prohibition of communication connection with the second electronic device, the second connection unit establishes communication connection with the second electronic device upon receiving the valid authentication information from the second electronic device. establish a
display system. The first electronic device is
a storage unit holding permitted device information indicating electronic devices permitted to communicate with the display device;
If the second electronic device is indicated in the permitted device information when the inquiry is received, a permission reply indicating permission for communication connection with the second electronic device is transmitted as the response.
6. A display system according to claim 5. establishing a communication connection with the first electronic device when valid authentication information is received from the first electronic device;
When receiving a request for communication from a second electronic device while the communication connection with the first electronic device is established, requesting the first electronic device about the communication connection with the second electronic device run the query,
establishing a communication connection with the second electronic device if the response to the inquiry indicates permission to establish a communication connection with the second electronic device;
if the response indicates prohibition of communication connection with the second electronic device, establishing communication connection with the second electronic device upon receiving the valid authentication information from the second electronic device;
Display device control method. A control method for a display system including a display device, a first electronic device, and a second electronic device,
The first electronic device transmits valid authentication information,
When the display device receives the valid authentication information from the first electronic device, the display device establishes a communication connection with the first electronic device,
The second electronic device transmits a request for communication,
When the display device receives the communication request from the second electronic device while the communication connection with the first electronic device is established, the display device sends the second electronic device to the first electronic device. Execute an inquiry about the communication connection with the device,
The first electronic device transmits a response to the inquiry,
the display device establishes a communication connection with the second electronic device when a response to the inquiry indicates permission for communication connection with the second electronic device;
if the response indicates prohibition of communication connection with the second electronic device, establishing communication connection with the second electronic device upon receiving the valid authentication information from the second electronic device;
How to control the display system.

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